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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0195a03a8711fb88d27796e855de4afc34810a4cef8c28869de6a4dbf839ebd' 
  AND token = 'AiqqsIH3P4y9pN5k1z+TqIfrKoroKD1PfAdSNNkXs/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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