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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '379e979f5ee6192faf0d5cf0285f782e3463418226fe6e9593f55a34cb2ce702' 
  AND token = '3qHBkI4QWeHfflLG8BIyOfaON/ms/qyQbjmBQdrVLPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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