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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd7da6d6477522bf3ff0a37eab74e2490a0b9127a4ee57e7e12c4ff12f0f2dc8' 
  AND token = 'NaKcYR/qPvH1fjicLGHlYkvsPqjPyLeIejvd2q73yO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00115

JSON explain

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