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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fffccd9c9c496a8b1d0472686d2d73b2fb017b36d907f9581c0531a5bb64f6a' 
  AND token = '2a1w7bnpITrdzYobC/jz7eDWkmErjWzhz+7CkPXHf2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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