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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de0bc325ea1ab4a2e74ef2fd94df0bce01765da5874edaedc4ac0ba76036e129' 
  AND token = 'Srf7FYieNeS88G6IC/Dgc81MN+C5oMbHxcVZDdgBhJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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