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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49c3d56184ed85c563f35e2d40ea110c45376db57e325fb24fcb1de9c8d987ea' 
  AND token = 'WgkFJsAvvyFw9MEmKl5Axo2d+JNe7zgFn+YuEjqn764=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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