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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaf2eebbe2f2c09703b62c90cd2f7b1160fe432914141ee0fdb16ed9236b0f60' 
  AND token = 'ZHIT8Da54BUi6qMPH8pG4uSG0r+THf8sTJSfrvfcZyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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