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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfd866360aeff49c8d7cc8aff9cbdbec5945523612466d2cd3bf9dd132153ecc' 
  AND token = '9IT5RFGWflp8ysXhAJH3Bp3G5wCqNIyE0FOtUo9MV5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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