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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b326076ccd093bb9ce102f049b0bc2e2ae5e3bd37239969f64aea7935b66f62' 
  AND token = 'PbgOQaOtI9/kSubQxLbFifQ7MsZ1cfOZa2Hg0GJIIcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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