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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e93ea94c6a0765d165d3d942141417cdaa95d14f68b6822016885760bcad9a13' 
  AND token = 'H5K7fAZR7m6AxLfK6yYgh2AvLUY0dKggwOVaZkh2DgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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