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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8eb7c1842b258833eb0ea8a7dd5a6fbcf6698e371c28e6b01b83e5388f8adb41' 
  AND token = 'JJj/i6Mkt5zkCg12GYiEmL3dItGtp3C32pjnJnMnz3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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