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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd94759210ea40939046c619ebba7d355cb7ff77695f8b0c1a40783fe10339109' 
  AND token = 'uk0rfWzigmusoP0U5dMWfxDgcaV3tjCZWwsa+GULQyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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