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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2eaa2354e9a1dc63d9a47eda9eacd958ac36c045f41fc95a2e32ecd57f09cff3' 
  AND token = 'jyATKFv1FpPBbLsEbrEwr2sKRUtufPoTHd6zfGYOMwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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