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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54a332aaca252ad33ae52921574b2b333e6565cd04b2926c477cca8e1a961b99' 
  AND token = 'NwP4HtENXgbMWu4v0YNIKPLjonNZ/gi4IjxRRi9GrbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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