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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76c50abb622c9fc88d4e7ca8cb0e4cb6c8b0cf82a84c461f2efa0c50f9b1dd64' 
  AND token = 'pGuGOxHaEDgzOxg3FrKsfCZoBJ7Y0D97H9VNYE/FCm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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