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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ffb028fd8fccec8d0fb6126d187dded3243ec7a38aafb2938a3bb08f86e6370' 
  AND token = 'TxPly1vPSwtGj+dbrnbpYYIJvFcQmpcYGKUi6d82+uM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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