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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02f5db6e1f6f8f0d9475adc6ec4e816c4b7817c3b6e86ece9a1b766652dbb77a' 
  AND token = 'KiIWl1v/0apgouDZlSDxSWPslqkf43rlgnUxgU7XsjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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