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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e11b5f6f08376d41b39a6b7e3902cc4e5986c022483ae84fc36a9a5693b3975c' 
  AND token = 'lvUjpK5XAN+aL/wURNsmQh6D2LWnptfqINc2eIray8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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