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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fb7b30f8d0151ed81eaab25724774eccb6613ade0302866518acaad1ede1968' 
  AND token = 'Eptyu/k+0hwVsT8CvebWXl70sWhW5w7I0L+fnzyYjJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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