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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '296962eac554d612996e55b0bf32acb880e33d53ca4dad04d3ec1668f9b43925' 
  AND token = 'WvjDo8B4d23tHUg8QgkJeBr1oF0LzyCrWhXEYd1oFhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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