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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc7ee8c4c585568585c60485a7c6b45a3409e592e484bec5e629fdbeb72c1682' 
  AND token = '8g6J0NQw9qPqP1aRC1pGswj1nFdUCGmtzmsGlKmpwao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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