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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ae0bc5fbfd0c6393eb4f05326fcd42674003f41467ef7415a41057543c766ce' 
  AND token = 'dNYN4SLEXa+A/bXfeXTUpj2DmVn52J5rL0C86+1snmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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