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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd01ccac7803d1d4c6511ff0d23deb994484948c0892ab157929e0469e937c7f1' 
  AND token = 'ZBEgrlb8n5xdGgjOS3rt7KFb4K84mZwiWshOVxE2vgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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