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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f22718936594fb504542ac611ae0ff9938db39f64bb49840639632f06c33ee05' 
  AND token = 'bdMksoD+V/9sdOfB3jxk/QVNA9Jy+d+ux8N4C1E4HXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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