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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc1baec748e8a9796290050a51832c0e69f9bf40dd685c026fd22e7f8ef3b24c' 
  AND token = 'Qbf/BJSB7Tgpns93sAk5zUObn77UQ69sNAmIa8nVtVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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