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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac2640175098c9b8cf30a4f6e29d86335794ea06761d56a4c4823c20a2a83e18' 
  AND token = 'inR6y9sYKOCl+lYZpFFBB0IkLJsRcgw4N5jO6zTL30s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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