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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be0702b820430fc32a4218e8f987da932c247adf3d9639c9f8ba23769755f25d' 
  AND token = 'xuaN576uSg0oGq6vomrRp0zHNVlDSK4FE94u53Cpg3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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