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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7138aca28eb69ab2365a3bb1d0aace07c0ef7f0f268712f908049c56362bcdf' 
  AND token = 'B+70Xk1TnserF6Ztt5xHDCHqMXi/OqWCwk4Mp9ETSYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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