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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec46b5bed547396d3bde54fb045cd1bb1acd38fe017c2b6f66f7e61c873b7f3b' 
  AND token = 'uVegL1xRbmJqetx9kh4b9b/PX1mJqE7Cytd9saKL4DI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00074

JSON explain

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