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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dac6de4f62a24d485c9e29d7169205208b7873b898c9ddcd16ea2ef8ccfc83f5' 
  AND token = 'qWytMhe3IdXO0qLd1XK+tcg+32oovvjTP3mAR17X+0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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