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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee102907ade0e612bcc5dd4d34d32316680776ba739a28d7df1388c0b0c0fbd0' 
  AND token = 'hT0ErUsOq1tbMTgHD8xa0TdK6+tO0u1m8PGMmLDfHhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00094

JSON explain

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