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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbc119139b4d53bdbdb9d2a00fed431fb48ff9988287cba41c4ba9ea98ac98f2' 
  AND token = 'Xt5GxeKwN+tAS/VcijV5rwLmQIWo5qsuoshz4Hhnn7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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