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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fc3dd92e80efba934f60ccb66ab2cb37ce7df6936faf09c055f980a279185d9' 
  AND token = 'xtJp/8d+X9cqgsnDalxbqx6tsWucYED61p4HkY0qCKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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