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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f2af6f441f5e5c7b966cee541741195db5d17cc96401572801f3eedd12f40fc' 
  AND token = 'lFXiX8Af4nFBQGKGdT3jcnrkNZ5J6uPvIr+1z1bdR4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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