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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4e8fa16be71b1c6ead4bada81fa67b0b1b8409cf17c9a63e934a0b98be60366' 
  AND token = 'WH0kZmhhsv7bOhhD6vexzPF/WvatYWfc+68qfNw4Juc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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