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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6e49b4373c69d69c848073e45959810174c7ebac40c05f298bdcba48516a5d7' 
  AND token = 'vYQ7bIGMSen2mZ3RY5811pGEg6GkOxNbP6Ws3pJhkkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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