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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0862b13652e16cbc5ef1e866d98b2d016aff7ef0e82969667b403b19c29adb52' 
  AND token = 'mJJsR4BSIHquhWEgw/wbksObrzvgEqa2x2uO1SgFrHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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