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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a47ae9aaba6da4834ad498ab41da891a71b6169c5aad344fb41de7d0c0e91203' 
  AND token = 'tFjBbgg3tf29xwxMEU+ah5I6/3rLVszp8J+//N97uOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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