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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00f3aa85c837b76d1e5e8c319a00ceeede0dc2517b5e1021f0f6ff19f0d58233' 
  AND token = 'OrO682g+3u7QIZH4/QqOWwfMz4+N5zFmA5a6jflBPOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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