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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0af24b234c5c23fbda0952c9e38e7868f13c1a757cbe53e2465a897e8de6385e' 
  AND token = '4dp3aVB9YlsksqXtos0QA1jf5RpvE/fcLDRgVmgtJhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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