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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed38b23490a2f26ce874c5e1df0ba0c6eebeb32bee13151405da161e3ab10884' 
  AND token = 'LE8NIY8TtckAI/M95s1eujhNVnG5/2qrSP3BUuZTgxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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