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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd3aadd451a4c6c082e1ff0c36906e6fdec50d867a07d5183264bf3366a15282' 
  AND token = '5LaNz5qQlty2QYrZ8oukZPg4uurlWdH42+ZU2n8TATA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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