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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '558c5c268fa7f987207ff7c99ff39af5daf76b3a6fafa0640bd5b1b22ae1bc01' 
  AND token = 'aUWLcQRWkMWk1Ub9KF+bxdaer0jeqAexewU04okl/xs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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