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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62eaf4fde7d92b8bb9ba3e6689448340ed705572986be795542c80381dab4cb9' 
  AND token = 'aF9RRsNE5S4kK9mK/fU8K33kkFWsoxJ0/ZZxaEYHY6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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