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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f7b7a3f115eb46cbe7fafad866acdaedeaf3410265de9d7c69a8ec91e933f14' 
  AND token = '8PNOJe5Qzl1KoKyOCQW4MEBInxuozDgzDf0ZoHrc/Jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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