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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4a01c9b75aab3722dab972eacde576794807743af6a7c62d38402b099672caa' 
  AND token = 'bsrze2Ihrx5amP1SdnzzBrT7V4GkAj9nD0Cc/ok335o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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