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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02d3417be369685586babfe7bd55fd897f5b36b62de282d7b77f9ad24e5c8c75' 
  AND token = 'UeFPJ3OW3PTeGs/LarwAB12OdyT2Xmh92WXcaHdchno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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