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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc72cc555fe6eec6ffb91f54f3090c361de5f9aa401bd0222cfa802cd41d58e3' 
  AND token = '+l3eXkuQQCRySMt72qJ7tdMSDbQP6hHtNILUtyrrk7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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