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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dcee983e9fe54047101b222ea43cf7023a792cfe42e4b82ff750e4751696335' 
  AND token = 'VK6l0eNPxWKHz+4S7rZDz7I3U4AIHZU/EzQu/N7+0dM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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