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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cf0f3e4a6d4e0b62eea54386760fab311596dbd0c3c7f8f75903d9916a6b015' 
  AND token = 'TkKDnpOgXAro1x7hWozHy6gLJIQt2T+xu5APZ2immNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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