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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9333e31593978257cb5948ad6bef85e677fd96995c166c121ba796995fa7229' 
  AND token = 'E2170QbyVYBe4Esm3LVTi70bXyEKZ+tpvhaNc+WsaGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00135

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}