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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a5adf48d54d52bc7cf69e4bc8440015daa19ed2c3b97b219ebf7c1a2034f3dc' 
  AND token = 'bBnQm+u+z82A5nEyD4BUey6ojp8SGFg+7xsRtwXWhFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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