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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1efec364714702b009a73afa5dbb2b7bfb2ab24e30acb6d65ea642652aa2ef12' 
  AND token = 'i5w3IAAufqcqrNwSq5UN3yVAHMo5B+R30SqhATNboSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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