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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef099a7493c266b511e8116462b5cfa6aa4ffcfb068e605ab57905c81d4491f0' 
  AND token = 'p9Il3s5i9+LbfLOOnA4ddBp0QTDUQ4IC6z2QGUwontg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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