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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae929389402054897bf85e43211c7e5c6435f36591901532378d143f8f5773d7' 
  AND token = '7akIxtA8lRYqNB4m9W4mxw9yNnxYLQr8wWyz7WQUI2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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